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Incorrect CloudWatch alarm settingsĮach metric is defined by a namespace, a metric name, and up to ten dimensions. To force the alarm to be in ALARM or OK states, configure how the alarm treats these periods without data points. If an alarm is monitoring a metric that has no data points during a given set of periods, and missing data is being treated as missing, the state of the alarm is INSUFFICIENT_DATA during those periods. If there are no 5XX errors during a period, then the result is an empty period (rather thn a zero value). The Elastic Load Balancing (ELB) service sends data points to this metric when there is a 5XX response from an ELB. An example of an event-driven metric is the HTTPCode_ELB_5XX_Count metric for an Application Load Balancer.
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But, if you stop the instance, the service doesn't push any data points to it. This metric has a data point every five minutes. Other services push metric data when triggered by certain events, and might have periods without data points.Īn example of a period-driven metric is the default CPUUtilization metric of an Amazon Elastic Compute Cloud (Amazon EC2) instance. Some services send periodic data points to their metrics at regular intervals. There are two types of metrics based on how they are pushed to CloudWatch: period-driven and event-driven. Typically, an alarm transitions out of INSUFFICIENT_DATA within a few minutes of creation.Īn alarm in INSUFFICIENT_DATA state might reflect the normal behavior of a metric. It remains in this state until it completes its first evaluation of the metric being monitored. When you create a CloudWatch alarm, its first state by default is INSUFFICIENT_DATA.